import re

s = '例如踏踏实实、 密密麻麻、简简单单、时时刻刻是一些。。。'
pattern =  r'(([\u4e00-\u9fa5])\2([\u4e00-\u9fa5])\3)'
r = re.findall(pattern,s)
if r:
    for word in r:
        print(word[0])

